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https://www.dictionary.com/browse/lumen-hour
Lumen-hour definition, a unit of luminous energy, equal to that emitted in 1 hour by a light source emitting a luminous flux of 1 lumen. Abbreviation: lm-hr See more.
https://encyclopedia2.thefreedictionary.com/lumen-hour
lumen-hour. [ ′lü·mən ¦au̇r] (optics) A unit of quantity of light (luminous energy), equal to the quantity of light radiated or received for a period of 1 hour by a flux of 1 lumen. Abbreviated lm-hr. McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
https://www.infoplease.com/dictionary/lumen-hour
lu•men-hour. Pronunciation: (l'mun-our", -ou"ur), [key] — n. Optics. a unit of luminous energy, equal to that emitted in 1 hour by a light source emitting a luminous flux of 1 lumen. Abbr.: lm-hr. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., …
https://www.merriam-webster.com/dictionary/lumen
Medical Definition of lumen. 1 : the cavity of a tubular organ or part the lumen of a blood vessel. 2 : the bore of a tube (as of a hollow needle or catheter) 3 : a unit of luminous flux equal to the light emitted in …
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